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The prime mover for flexion of the shoulder muscles used are the following: 1  Pectoralis Major Clavicle. 2  Anterior Deltoid. 3  Biceps Brachii Short Head. 4  Coracobrachialis.
The most common shoulder injury is to the rotator cuff. This includes sprains, strains and tears to the muscles in the rotator cuff. There are four muscle groups in this area of the shoulder. They are the supraspinatus, subscapularis, infraspinatus and teres minor. They work together to operate the movement in the shoulder. The supraspinatus tendon is one of the important muscles in this movement.